Push in the overdrive button(located on the gear shift knob - below the shifter button).
Try replacing the transmission sensor/cable it is $35.The signal that tells the computer to turn OD back on is probably not making it to the transmission.
on the gear shifter
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A3g520
Hyundai Accent was created in 1994.
If your that stupid you don't need to be driving
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Timimg marks 2007 hyundai accent